It seems to me that this is crash in fglrx. So:
Thanks for the report. We are sorry that we cannot help you with your problem,
but we are not able to support binary-only drivers. If you would be able to
reproduce this issue using only open source software, please, reopen this bug
with the additional information, but in meantime I have no choice than to close
this bug as CANTFIX (because we really cannot fix it).

FWIW, I restored the old libGL* and run the vesa driver, and tried it again,
couldn't get it to crash; and get back to the proprietary libGL* and fglrx driver
and tried also and it won't crash. So maybe it was a one-off event; and surely
I don't want to see it again :-).

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